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    STUDIA CHEMIA - Issue no. 1-2 / 2002  
         
  Article:   KINETICS AND MECHANISM OF P-XYLENE OXIDATION BY CE(IV) IN AQUEOUS ACIDIC MEDIUM.

Authors:  CLAUDIA GEMMA MUREŞANU, GABRIELA-CRISTINA BUCŞA, IOAN BÂLDEA.
 
       
         
  Abstract:  The oxidation of p-xylene by Ce(IV) in aqueous acidic media has been followed spectrophotometrically in a reaction mixture containing HClO4 and NaClO4. The effects of p-xylene and hydrogen ion concentration on the reaction rate have been studied. The kinetic study revealed a two-stage process. The experimental rate law exhibits a first-order dependence on Ce(IV) concentration and a complex dependence on p-xylene and hydrogen ion concentrations. Apparent activation parameters were also calculated. A reaction mechanism involving the formation of an adduct between p-xylene and Ce(IV) in the first step was suggested. The adduct is the subject of an inner electron transfer, in the next step, in order to yield the products.  
         
     
         
         
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